Abstract
On the basis of the 19 F data of substituted α,β,β-trifluorostyrenes and the rate constants of their thermal cycloaddition reactions, a self-consistent and cross-checked scale of spin-delocalization substituent constants σ . JJ is proposed for 21 para-substituents and for 10 met-substituents. By means of adopting different π mb values, three methods for the calculation of the σ . JJ , values at five different temperatures and their averaged values are presented
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